2013年
Measuring cosmic inhomogeneities with information entropy
MULTIVERSE AND FUNDAMENTAL COSMOLOGY: MULTICOSMOFUN '12
- 巻
- 1514
- 号
- 1
- 開始ページ
- 97
- 終了ページ
- 100
- 記述言語
- 英語
- 掲載種別
- 研究論文(国際会議プロシーディングス)
- DOI
- 10.1063/1.4791734
- 出版者・発行元
- AMER INST PHYSICS
In standard cosmology, the global dynamics of the universe is assumed to be described by a homogeneous and isotropic FLRW universe model, but a realistic universe model should include local inhomogeneities, and the physical properties of such a realistic model averaged over a sufficiently large scale do not necessarily coincide with those of the FLRW universe. In this article, we give an overview of works studying how local inhomogeneities affect the global expansion. We also point out that, in the framework of averaging inhomogeneities, a natural measure of inhomogeneity is derived, which is known as the relative information entropy in information theory. The temporal behavior of the measure and the relation to the Weyl curvature invariant are explored using the linear perturbation theory of a spatially flat FLRW universe.
- リンク情報
- ID情報
-
- DOI : 10.1063/1.4791734
- ISSN : 0094-243X
- Web of Science ID : WOS:000317008900019